Pressure balancer



Feb. 16, 1932. l H, H, ROBlNSON 17,845,722

PRES SURE BALANCER Filed Jan. 2?, 19250 llnlma nl' nl i mm ATToRNEx Patented Feb. 16, 1932 i 1,845,722

UNITED STATES PATENT OFFICE HENRY n. nonINsoN, or Los nirannnacamroanm i rarissima BALAncEa t `Application lcd January 27, 1930.V SerialNo. 423,756.` In this specification, and the accompanyclude; first, to "provide a simple auxiliary ing drawings, I shall describe and show a device that is adapted to co-operate with preferred form of my invention, and spe- Standard 'forms oi' fittingsxof the general A cically mention certain of its more imporclass described, to balance the outward thrust forms disclosed, since various changes and balancing force by meansof the internal presadaptations may be made therein without desure in the fitting, so that the outward presparting from the essence of my invention as sure upon the Operating IO. may be balhereinafter claimed; and `oluects and adanced at all times, irrespective of the actual Ic vantages, other than those specifically menpressure inthefitting; third, to furnish a de- 00 tioned, are included within its scope. vice of this nature that may be Conveniently My invention relates to improvements in applied and disconnected at will, and one pressure balancers for orifice fittings and the which will in no way interfere with the norlike, wherein provision is made for withdrawmal and regularprocedure for manipulating 15 ing an orifice plate, or other member, into an the opclatlngrod and fourth,to` accomplish 65 auxiliary chamber under pressure, for the .the above by meansoi a very simple, dependpurpose ofremoving it, A device 0f Such naable, and, relatively inexpensive construction. ture is illustrated in U. S. Patent No. y My objects are attained in the manner il- 1,569,305, granted to Anson Robinson on lustrated` in theaccompanying drawings, in

20 Januar 12th, 1926. The construction of that Wl11ch: ,Y i y, t t 70 patent as been utilized herein, for the pur- Figurel is anl end elevation, of a typical pose of illustratingthe improvement constiform of an orifice itting, of1the general class tuting the present invention, and the manner described, to which` my` improved` balancer of its application to this general class of con hasbeen applied, certain portions of the Vcon- 2 Fittings of the general class of which the the purpose of 'disclosing the internal parts; construction shown in said patent is an ex- `FigureQ is a plan view of the above conample, are adapted for use only with moderstruction; and, p ate pressures, except in the case ot' the small- Figure `3 isa side `elevation of said fitting,

er sizes. This is so because there is always an and of my balancer applied` thereto, in cen- 80 unbalanced pressure upon the operating rod tralsection.` 4 t by which the interior parts are manipulated. Similar reference `numerals refer to simi- In modern practice it is desirable to be able lar parts throughout the several views.

to use such devices in connection with very In the drawings I have illustrated the body tant objects. I do not limit myself to the upon the operating rod;second,tosecure such |55` structions. struction having been shown broken away for 75 y 35 high pressures, up to a thousand `pounds per memberof, a standard orifice fitting at 5. 85

square inch or more. The tendency also is to This fitting has a bore 6 therethrough, a rcthe use of large size fittings whenever this movable orice plate 7 intersecting the bore, is feasible. Under the latter conditions, the an auxiliary chamber 8 into which the orifice unbalanced pressure upon the operating rod plate` may be withdrawn for removal; and a i0 is inconveniently great,and ma be beyond slotted plug-cock^9,` intermediate the bore 90 the capacity of one man to hanc le. For inand chamber. The orifice plate ismanipulatstance, if the operating rod is three-quarters ed by means of an operating rod lO which of an inch in diameter, and the working presenters the chamber througha stuffing box 11, sure is 1000 lbs., the unbalanced pressure on andis adapted to screw into a tapped hole in U45 the rod will be approximately lill pounds. the upper edge of the plate. The operating 95` Obviously such an unbalanced force would rod and `plate are adapted to pass through prevent a man from conveniently manipua slotl2 inthe plug-cock, and,`after they are lating the rod. `withdrawn therethrou h, the plug-cock may With the above conditions in mind, the be turnedto its close position to shut ofi' W salient objects of the present invention incommunication between chamber 8 and bore 100 6. The bonnet 13 may then be removed to permit complete Withdrawal of the orice plate. The insertion of a new orifice plate is made by a reversed series of operations, in a manner that will be obvious.

In operating such a device, the rod has to be moved longitudinally, and also rotated to screw it intotlie tapped hole of the orifice plate. Hand-grip 14 is provided for conveniently accomplishing these manipulations,

Constructions of theclafss" described may be easily handled in small sizes, or larger sizes when under moderatel pressure. Under heavy pressure',`r wherev the operating rod 10 has to be of correspondingly large diameter, the unbalanced' pressure tending to Y push it out through the' stufng box may be so-great as to be" beyond the capacity of a man toliandle.'

My auxiliary pressure balancer comprises a tube 15, that is op'en to the atmosphere at the bottom, and that communicates at the top with chamber 8, as through the passages 16 and 17. A balancer rod 18 enters the upper endof tube V lthrough a stuffing-box 19, and carries a packed .piston 2O at its lower end'. The upper end of this rod 'carries a bridging member 21, whereby it may be operatively connected to operating rod 10. This connection may be conveniently made in the manner illustrated in the drawings, wherein the bridging member is shown as having a transversely notched outer end 22', adapted to en.- gagea' peripheral groove of hand-grip 14. This engagement may be readily accomplished,^since balancing ro`d'18 may be rotated; andthe engagement, when: made, may be 1. In combination with a fittinof that is adapted for withstanding internal {Iuid pressure; a member comprising a longitudinally slidable stern extending into said fitting from outside thereof, and subject to said pressure in a manner that would tend to expel it; a longitu'dinallywslidablepiston that isy directly subject to said pressurev in a direction' opposite the expelling pressure on the stem; a piston rodw extending from said piston externally f thel fitting# and means connecting the piston rodand stem, externally of the fitting, to constrain them to move alike.

V2. Incombination with a fitting that is adapted for withstanding internal fluid pressu'rega member comprising a'longitudinally slidable stem extending Ainto saiditt-ing4 from outside thereof, and subject to sa'idpressure in a' nia-nner that would tend to' expel it; a longitudinally slidable piston'thatl is directly' subject to' said pressure in' a direction oppo-A site tol the expelling pressure on the stem; ar rod extending from said piston parallelto said stem externally of the fitting;v anda swingable bridge separabl'y connecting the rod and stem, externally of the fitting, to constrain them to move alike-.z g

HENRY I-I".` ROBINSON.V

maintained in some convenient manner, asby the latching-b'ar 23. In'tlie above described construction, the upward pressure upon the operating'rocd 10 maybe exactly balanced'by thel downward pressure upon piston providing that the cross-sectional area of rod 10 is made the same as the annular portion of piston 20,.upon which pressure is exerted. This will be true irrespective of actual variations of pressure in chamber 8. Thereforean operator may freely manipulate rod 10, Without appreciablev effort.

My pressure balancer may be applied to standard construction in various ways., that will be apparent to those familiar with the design and operation of such devices. In the application illustrated, the upper flange 24 of` body member 5- hasr been extended a flanged tting 26, carrying stuffing box 19 andtube 15, has been mounted. A downwardly 1 sloping passage 16 has been drilled in flange 24, in a position to establish communication between chamber 8 andpassages 17.

Having thus fully described my invention, in a manner that will make its construction andl operation clear to thoseY familiar with the art involved, I claim:

laterally, as at 25; and upon this extension 

